V-Com Adjust(Only Lgd(M+S) Module); Model Name & Serial Number D/L; Signal Table; Outgoing Condition Configuration - LG 19LV2500 Service Manual

4.5. V-COM Adjust(Only LGD(M+S) Module)

- Why need Vcom adjustment?
The Vcom (Common Voltage) is a Reference Voltage of
A
Liquid Crystal Driving.
-> Liquid Crystal need for Polarity Change with every frame.
Data (R ,G,B ) &
Cont rol si gnal
Ti m i n g
S
Co nt r o ll e r
Da t a I n p u t Da t a I n p u t
Y
S
T
E
Power Input Po w e r
Po w e r I n p u t
Blo ck
M
V
V
COM
- Adjust sequence
· Press the PIP key of th ADJ remote control.(This PIP key is
hot key to enter the VCOM adjusting mode)
(Or After enter Service Mode by pushing "ADJ" key, then
Enter V-Com Adjust mode by pushing "
Com".)
· As pushing the right or the left key on the remote control,
and find the V-COM value which is no or minimized the
Flicker. (If there is no flicker at default value, Press the exit
key and finish the VCOM adjustment.)
· Push the "OK" key to store value. Then the message
"Saving OK" is pop.
· Press the exit key to finish VCOM adjustment.
(Visual Adjust and control the Voltage level)

4.6. Outgoing condition Configuration

When pressing IN-STOP key by Service remote control, Red
LED are blinked alternatively. And then Automatically turn off.
(Must not AC power OFF during blinking)
4.7. Hi-pot Test
Confirm whether is normal or not when between power
board's ac block and GND is impacted on 1.5 kV(dc) or 2.2
kV(dc) for one second.
Copyright ©2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Ga mma
Re f e r e nce V o ltage
Data (R ,G,B ) & C ont ro l s ignal
Gamm a Reference
Cont rol si gnal Volta ge
So urce D r i v e I C
Column Line
V
COM
C C
LC ST
COM Row Li ne TFT
G
" key at "10. V-
5. Model name & Serial number D/L
• Press "Power on" key of service remocon.
(Baud rate : 115200 bps)
• Connect RS232 Signal Cable to RS-232 Jack.
• Write Serial number by use RS-232.
• Must check the serial number at the Diagnostics of SET UP
Circuit Block
menu. (Refer to below).
Pane l
Liquid
Crys tal

5.1. Signal TABLE

CMD LENGTH
CMD : A0h
LENGTH : 85~94h (1~16 bytes)
ADH : EEPROM Sub Address high (00~1F)
ADL : EEPROM Sub Address low (00~FF)
Data : Write data
CS : CMD + LENGTH + ADH + ADL + Data_1 +...+ Data_n
Delay : 20ms
5.2. Command Set
No. Adjust mode
1 EEPROM WRITE
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0,
Phase
Data write : Model Name and Serial Number write in
5.3. Method & notice
A. Serial number D/L is using of scan equipment.
B. Setting of scan equipment operated by Manufacturing
Technology Group.
C. Serial number D/L must be conformed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0.
- 13 -
ADH ADL DATA_1 . . .
CMD(hex) LENGTH(hex)
A0h 84h+n
EEPROM,.
Data_n CS DELAY
Description
n-bytes Write(n=1~16)
LGE Internal Use Only